class A {
    v = 23
    constructor(a) {
        this.a = a
    }
    fg() {
        console.log('this.a :>> ', this.a);
    }
}


class B extends A {
    constructor(a) {
        super(a)
    }
    cc() {
        // super.a = '1'
        console.log('super :>> ', this.v);
        super.fg()
    }
    fg() {
        console.log('111 :>> ', 111);
    }
}

new B(1212).cc()